- Berlo , David K. and Lemert , James B. 1961 . “An Empirical Test of a General Construct of Credibility,” . paper presented at the SAA Convention . December 1961 , New York.
- McCroskey , James C. 1966 . “Scales for the Measurement of Ethos,” . SM , XXXIII March : 65 – 72 .
- Rokeach , Milton and Rothman , Gilbert . 1965 . “The Principle of Belief Congruence and the Congruity Principle as Models of Cognitive Interaction,” . Psychological Review , LXXII March : 128 – 142 .
Speech Monographs
Volume 34, 1967 - Issue 2